Sodium Naphthalene Sulfonate Formaldehyde Condensate SNF/PNS/FDN for Concrete

Sodium Naphthalene Sulfonate Formaldehyde (SNF) is an anionic surfactant and belongs to the naphthalene-based superplasticizer. It has good dispersibility, high water reduction rate and strengthening effect.

It is one of the most widely used traditional water reducers in the field of concrete admixtures.

1. Main performance characteristics

✅ High water reduction rate (15%-25%), significantly reducing the amount of water used in concrete mixing and improving strength.

✅ Improve fluidity, enhance the pumpability and workability of concrete.

✅ Enhance the early and late strength of concrete, and improve the compressive and flexural strength.

✅ Does not contain chloride ions, will not corrode steel bars, and improve the durability of concrete.

✅ Wide adaptability, suitable for various cements and mineral admixtures.

✅ High cost performance, lower cost than polycarboxylate water reducer, widely used in conventional concrete projects.

2. Main application areas

SNF is a classic naphthalene-based water reducer, suitable for various concrete and cement-based materials, such as:

(1) General Concrete

Applicable to C15-C60 grade general concrete to improve construction performance.

(2) Pumped Concrete

Enhance the pumpability of concrete, reduce pipeline blockage, and improve construction efficiency.

(3) Precast Concrete

Improve early strength, shorten demoulding time, and improve precast production efficiency.

(4) Mass Concrete

Control water-cement ratio, reduce shrinkage cracks, and improve durability.

Typical applications: dams, underground projects, and infrastructure construction.

(5) Mortar & Cement Products

Used for self-leveling mortar, dry mortar, grouting materials, brick and tile products, to improve fluidity.

(6) Ceramics & Refractories

As a dispersant, it improves the rheological properties of ceramic green bodies and refractories and improves the molding quality.

3. Usage

Recommended dosage: 0.5%-1.5% (by cement mass ratio).

It can be directly added to concrete or used in combination with retarders, air entraining agents, etc.

It is recommended to conduct a compatibility test before use to optimize the mix ratio.

4. Conclusion

Sodium naphthalenesulfonate formaldehyde condensate (SNF) is a cost-effective and widely used classic naphthalene-based high-efficiency water reducer.

It is widely used in ordinary concrete, pumped concrete, prefabricated components, mortar and ceramics.

Its slump retention is not as good as that of polycarboxylate water reducer (PCE).

However, it is still one of the preferred admixtures for many engineering projects due to its good water reduction effect and low-cost advantages.